Answer:
[tex]d = \sqrt{ {(y2 - y1)}^{2} + {(x2 - x1)}^{2} } \\ 10 \\ d = \sqrt{ {9}^{2} + \ {( - 6)}^{2} } = \sqrt{81 + 36} = \sqrt{117} \\ \\ 19 \\ \sqrt{ {( - 4)}^{2} + {( - 8)}^{2} } = \sqrt{16 + 64} = \sqrt{80} \\ \\ 20 \\ \\ \sqrt{ {4}^{2} + {15}^{2} } = \sqrt{16 + 225} = \sqrt{241} [/tex]
